package com.wjs.gulimall.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.es.SkuEsModel;
import com.atguigu.common.utils.R;
import com.wjs.gulimall.Feign.ProductFeignService;
import com.wjs.gulimall.config.GulimallElstaicSerchConfig;
import com.wjs.gulimall.constant.EsConstant;
import com.wjs.gulimall.service.MallSearchService;
import com.wjs.gulimall.vo.AttrRespVo;
import com.wjs.gulimall.vo.BrandVo;
import com.wjs.gulimall.vo.SearchParam;
import com.wjs.gulimall.vo.SearchResult;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class MallSearchServiceImp implements MallSearchService {

    @Autowired
    private RestHighLevelClient esRestClient;

    @Autowired
    private ProductFeignService productFeignService;

    @Override
    public SearchResult search(SearchParam searchParam) {
        SearchResult result = null;
        //构建Dsl语句
        SearchRequest request = buildSearchRequest(searchParam);
        try {
            SearchResponse response = esRestClient.search(request, GulimallElstaicSerchConfig.COMMON_OPTIONS);
            result=buildSearchResult(response,searchParam);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 根据数据构建响应对象
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response,SearchParam param) {
        SearchResult result=new SearchResult();
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModels=new ArrayList<>();
        if(hits.getHits()!=null&&hits.getHits().length>0){
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel model = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())) {
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    model.setSkuTitle(string);
                }
                esModels.add(model);
            }
        }
        // 1封装查询到的所有数据的信息
        result.setProducts(esModels);
        //2、当前所有商品设计到的所有属性信息
        List<SearchResult.AttrVo> attrVos=new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            // 1、得到属性的id
            Long attrId = bucket.getKeyAsNumber().longValue();
            // 2、得到属性的名字
            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            // 3、得到属性的所有值
            List<String> attrValue = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                return item.getKeyAsString();
            }).collect(Collectors.toList());
            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValue);
            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);
        //3、当前所有商品的分类信息
        ParsedLongTerms Catalog_agg = response.getAggregations().get("catalog_agg");
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = Catalog_agg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            // 得到分类id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));
            // 得到分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);
        //4、当前所有商品的品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            // 1、得到品牌的id
            long brandId = bucket.getKeyAsNumber().longValue();
            // 2、得到品牌的图片
            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            // 3、得到品牌的姓名
            String brandname = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandName(brandname);
            brandVo.setBrandId(brandId);
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);
        //5、分页信息 - 总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);
        //6、分页信息 - 页码
        result.setPageNum(param.getPageNum());
        //7、分页信息 - 总页码
        int totalPages = (int) total % EsConstant.Product_PageSize == 0 ? (int) total / EsConstant.Product_PageSize : ((int) total / EsConstant.Product_PageSize + 1);
        result.setTotalPages(totalPages);
        List<Integer> pageNavs = new ArrayList<>();
        for(int i = 1; i <= totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        // 8、构建面包屑导航功能
        if (param.getAttrs()!=null && param.getAttrs().size() >0){
            List<SearchResult.NavVo> collect = param.getAttrs().stream().map(attr -> {
                // 1、分析每个 attrs传递过来的值
                SearchResult.NavVo navo = new SearchResult.NavVo();
                // attrs=2_5寸：6寸
                String[] s = attr.split("_");
                navo.setNavValue(s[1]);
                R r = productFeignService.getAttrInfo(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));
                if (r.getCode() == 0) {
                    AttrRespVo data =(AttrRespVo) r.getData("attr", new TypeReference<AttrRespVo>() {
                    });
                    navo.setNavName(data.getAttrName());
                } else {
                    navo.setNavName(s[0]);
                }
                // 取消这个面包屑导航以后，我们要跳转到那个地方，将请求地址的url里面的当前置空
                //拿到所有的查询条件后，去掉当前
                // attrs=15_海思(Hisilicon)

                String replace = replaceQueryString(param, attr,"attrs");
                navo.setLink("http://search.gulimall.com/list.html?" + replace);

                return navo;
            }).collect(Collectors.toList());
            result.setNavs(collect);
        }
        // 品牌、分类
        if(param.getBrandId() != null && param.getBrandId().size() > 0) {
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");
            //TODO 远程查询所有品牌
            R info = productFeignService.infos(param.getBrandId());
            if (info.getCode() == 0) {
                List<BrandVo> brand = (List<BrandVo>) info.getData("brand", new TypeReference<List<BrandVo>>() {});
                StringBuffer buffer = new StringBuffer();
                String replace = "";
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getName() + ";");
                    replace = replaceQueryString(param,brandVo.getBrandId() + "","brandId");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);
            }
            navs.add(navVo);
        }

        return result;
    }

    private String replaceQueryString(SearchParam param, String value, String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            encode = encode.replace("+","%20");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return param.get_queryString().replace("&" + key + "=" + encode, "");

    }

    /**
     * 准备检索请求
     * #模糊匹配、过滤（按照属性、分类、品牌、价格区间、库存）、排序、分页、高亮、聚合分析
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam searchParam) {
        SearchSourceBuilder sourceBuilder=new SearchSourceBuilder();//构建DSL语句
        //1 构建bool-query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1 must-模糊匹配
        if(!StringUtils.isEmpty(searchParam.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",searchParam.getKeyword()));
        }
        // 1.2 bool - filter 按照三级分类id来查询
        if(searchParam.getCatalog3Id()!=null){
            boolQuery.filter(QueryBuilders.termQuery("catalogId",searchParam.getCatalog3Id()));
        }
        // 1.3 bool - filter 按照所有指定的属性来进行查询
        if(searchParam.getAttrs()!=null&&searchParam.getAttrs().size()>0){
            for (String attr : searchParam.getAttrs()) {
                // attr=1_5寸:8寸&attrs=2_16G:8G
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
                String[] s = attr.split("_");
                String attrId=s[0];//检索的属性id
                String[] attrValue = s[1].split(":");
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValue));
                // 每一个必须都生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }
        // 1.4 bool - filter 按照库存是否存在
        if(searchParam.getHasStock()!=null){
            boolQuery.filter(QueryBuilders.termsQuery("hasStock",searchParam.getHasStock()==1));
        }
        // 1.5 bool - filter 按照价格区间
        if(!StringUtils.isEmpty(searchParam.getSkuPrice())){
             //1_500/_500/500
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = searchParam.getSkuPrice().split("_");
            if(s.length==2){
                rangeQuery.gte(s[0]).lte(s[1]);
            }else if(s.length==1){
                if(searchParam.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(s[0]);
                }
                if(searchParam.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(s[0]);
                }
            }
            //把以上条件进行统一封装
            boolQuery.filter(rangeQuery);
        }
        sourceBuilder.query(boolQuery);
        //2.1、排序
        if(!StringUtils.isEmpty(searchParam.getSort())){
            String[] s = searchParam.getSort().split("_");
            SortOrder order=s[1].equalsIgnoreCase("asc")? SortOrder.DESC:SortOrder.DESC;
            sourceBuilder.sort(s[0],order);
        }
        // 2.2 分页
        sourceBuilder.from((searchParam.getPageNum()-1)*EsConstant.Product_PageSize);
        sourceBuilder.size(EsConstant.Product_PageSize);
        //2.3 高亮
        if(!StringUtils.isEmpty(searchParam.getKeyword())){
            HighlightBuilder builder=new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }

        /**
         * 聚合
         */
        //1、品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        //品牌聚合的子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(2));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(2));
        //加入builder
        sourceBuilder.aggregation(brand_agg);
        //2、分类聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        //加入builder
        sourceBuilder.aggregation(catalog_agg);
        //3、属性聚合 attr_agg
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        // 聚合出当前所有的AttrId
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        attr_agg.subAggregation(attr_id_agg);
        //加入builder
        sourceBuilder.aggregation(attr_agg);
        System.out.println("构建的DSL"+sourceBuilder.toString());
        SearchRequest request = new SearchRequest(new String[]{EsConstant.Es_index},sourceBuilder);
        return request;
    }
}
